Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b7d68d484a8734…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 10:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5ae480e627f32e80867f446307fb96d3 SHA-1: 3841da4f985f406fc3a9b05b7d464b7e6596d2ae SHA-256: b5b7d68d484a87345a760d3e46ba592495c5b1be954c2298a95f988f911d874b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hongphuc.vn/userfiles/file/74355558928.pdf In PDF document text
    • https://magatek.com/documents/file/nunomu.pdfIn PDF document text
    • http://aimic.com/userfiles/file/ginujokikumosojuji.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/21006429002.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/49311951447.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/14899683145.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7803766082.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/89753794940.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/43706403677.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d860b701---nefidupuviziwezotamekivaz.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210903005259_j2ibm8.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ecaaa1273---jukekobupaxebevalodib.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/lawazileselumarazudapuwi.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///riwatunow.pdfIn PDF document text
    • https://eurotig.ro/file/juwepi.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/fiwilo.pdfIn PDF document text
    • http://mfcpavpos.ru/file/kologoro.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16140702450aaf---53756615382.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/kobowedoselorazaxalad.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/adc5152c3f4fb0306cc1b9b8e752509d/viwelaleguzut.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/95646178296.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/53698475083.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/maxevu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613f73fdea089---kilerewuvupegubilifebalo.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/76075804205.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/25024816365.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/24027339307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=anger+of+stick+5+unlimited+coinsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 10964 bytes
SHA-256: 98e738f8333351cc6642612e74ac93210bd6235c43211ca79bb70e7517a9156f
font_01_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 18736 bytes
SHA-256: aee9d29edf7f8f3f85eaa98911b48820c60e804caf61c548f499a67c78ed88b0
font_02_sfnt_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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